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Post by jimbo on Jan 8, 2020 19:46:45 GMT
Unfortunately in that respect they are a retrograde step from the previous D Stock, in that NO action was required if the rear trip was operated and no slow-speed operation was necessary. Progress ? I have a feeling it was 1972TS when someone decided there was no point in stopping a rear-tripped train, so a trip was only effective at the front of the train. It was only when rules for working defective trains were being written that it was realised that if the front cab controller jammed, the driver had to work from the rear cab with the guard riding up front without a tripcock for protection! A second person had to be obtained for extra protection. Rear trips again had to become effective on subsequent trains! I was just thinking that the modern electronic trains are to operate on the Piccadilly line with tripcock protection for their first ten years or so. If there is no point in stopping a back-tripped train, then what is needed is for the controller to detect the front tripcock in forward motion, and the rear tripcock in reverse motion. This would cover the problem if the front controller should jam, and the train be controlled from the rear cab. |
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Post by underover on Jan 9, 2020 18:18:47 GMT
I have a feeling it was 1972TS when someone decided there was no point in stopping a rear-tripped train, so a trip was only effective at the front of the train. It was only when rules for working defective trains were being written that it was realised that if the front cab controller jammed, the driver had to work from the rear cab with the guard riding up front without a tripcock for protection! A second person had to be obtained for extra protection. Rear trips again had to become effective on subsequent trains! I was just thinking that the modern electronic trains are to operate on the Piccadilly line with tripcock protection for their first ten years or so. If there is no point in stopping a back-tripped train, then what is needed is for the controller to detect the front tripcock in forward motion, and the rear tripcock in reverse motion. This would cover the problem if the front controller should jam, and the train be controlled from the rear cab. In which case, is it not easier to just drive from the other end, in which case the tripcock is active? Can't remember off the top of my head if tripcock is cutout in reverse |
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